Valved piston



N. KOLTZ.

VALVED PISTON.

V APPLICATION FILED ocr. 24, 1918.

Patented June 10, 1919.

ATTORNEY nlwms PETEIS'IOY.PKORLLIYNOHWASMINGIUN n c UNITED STATES PATENTOFFICE.

NICHOLAS KOL'IZ, OF FOND DU LAC, WISCONSIN, ASSIGNOR, BY DIRECT ANDMESNE ASSIGNMENTS, TO PHILLIP H. WEAVER, OF FOND DU LAC. WISCONSIN.

VALVED PISTON.

Application filed October 24, 1918.

To all whom it may concern:

Be it known that I, NIonoLAs KoL'rz, a subject of the Emperor ofGermany, and resident of Fond du Lac, in the county of Fond du Lac andState of Wisconsin, have invented certain new and useful Improvements inValved Pistons; and I do hereby declare that the following is a full,clear, and exact description thereof.

My invention relates to new and useful improvements in pumps, moreparticularly of that portable type adapted for inflating tires or forsimilar uses.

Air pumps of this character are usually provided with a piston headcarrying a cupped packing member, which is dilated to packing engagementwith the cylinder wall by; 'air ressure at one side of the head, andwhich is yi'eldable to permit air to flow between it and the cylinderwhereby to introduce the compression charge of air into the cylinder. Aconsiderable objection is encountered in'the use of a valve packing ofthis character by reason of the escape of air which may occur prior tothe building up of sufficient com ression pressure in the cylinder toexpan the packing member and effect a proper seal with the wall of thecylinder, this disadvantage being increased upon stifi'ness of thepacking member due to continued use of the pump, and upon the use of thepump for procuring the relatively high pressures necessary in automobiletire inflation.

It is primarily the object of my invention to provide a pump structurewherein an eflicient packing between the piston head and cylinder wallis at all times maintained, and wherein the flow of air past the pistonis controlled in a positive manner so that the pump will immediatelytake-up its work of compression upon starting the compression stroke ofthe piston, and so that a most ready flow of the compression charge ofair past the piston head may be permitted.

A further object of my invention resides in the provision of a pistonhead structure for pumps of this character which may be manufactured ata minimum cost consistent with a maximum efliciency of operation.

A further object resides in the provision of an improved packingarrangement for the piston head.

A With the above and other objects and advantages in view, which 'willbe apparent as Specification of Letters Patent.

Patented June 10, 1919.

Serial No. 259,573.

the description proceeds, my invention resides in the novel features ofconstruction, combination and arrangement of parts as hereinafterdescribed and defined by the ap pended claims.

Inthe accompanying drawings:

Figure 1 shows my invention applied to a. pump of the conventionaldouble cylinder type used for inflating automobile tires, or similaruses.

Fig. 2 is a fragmentary sectional view of the cylinders and pistonheads.

Referring now more particularly to the accompanying drawings, 5designates a pump base on which are mounted the pump rylinders G and 7respectively, connected at their upper ends by the usual head 8 in whichthe piston rods 9 and 9 are slidable. A flexible tube 10 extends fromthe head and is in conventional communication with the cylinder 7. Thelower ends of this cylinder are connected by the usual passage 11 shownin dotted lines in Fig. l. The up r ends of the piston rods are providedwith a common handle 12. The piston head of the larger cylinder (3comprises a cylindrical block 13 provided with a central longitudinalbore i l having its lower portion enlarged, the intermediate portion ofthe bore being taperingly reduced to merge into the diameters of theupper and lower portions. The lower portion of the block is externallyreduced, forming an annular shoulder 15 at lllr juncture with the upperportion of the hlork, and this shoulder forms a seat for the laterallyturned upper side portion of a packing band-l6. A follower ring 17 isloosely mounted on the lower portion of the piston head block and fitswithin the follower ring to bear against its laterally turned portion,and a nut 18 is threaded on the head block and bears against thefollower ring to clamp the laterally turned portion of the packing handbetween the ring and the shoulder 15. It is noted that the width of thepacking band is such that in this clamping relation, the lower end ofthe band engages the nut 18 and the band is thus transversely compressedwhereby to expand it against the wall of the cylinder to procure amaximum packing efliciency.

A valve seating rin 19 is shrunk within the enlarged portion 0 the boreof the head block, being spaced inwardly from the mouth of said enlargedportion, and a retaining disk 20 is shrunk in said month portion. A flatconical valve member is con fined between the disk 20 and the ring 19,and is adapted to seat against said ring to close the bore, said valvemember Al being provided with axially extended pins 22 engaging in thedisk 20 and in the passage of the seating ring 15) whereby to hold thevalve member for proper seating moven'ient. It is noted that the valvemember is nearly equal in diameter to the bore, whereby to furtherprevent lateral movement thereof, and the peripheral portion of thevalve members is recessed at intervals to facilitate passage of airtherepast. The holding disk 20 is provided with an annular series ofports 23 which open at the peripheral por tion of the valve and whichassist in seating the valve by impinging the air against said peripheralportion or skirt of the valve. The valve piston rod 9 is secured to thehead block by threaded engagement of its lower end in the bore 14, whichthus closes the upper portion of the bore. Passage of air from theintermediate portion of the bore is effected by longitudinal bores 2textending from the top of the head block and communicating with radialbores 25 which open into the intermediate portion of the mainlongitudinal bore It. It is noted that the outer ends of these radialbores 25 are closed by the follower sleeve 17.

Thus, upon downward movement of the piston head block, the valve memberwill seat immediately against the ring 19, particularly by impingementof air against its skirt portion through the ports 2:2, and thus preventpassage of air through the piston head. In the outward movement of thepiston head, free passage of air is permitted through the bores 25 andthrough the main bore 14 around the valve member.

The piston hea d of the smaller cylinder 7 comprises a somewhat similarblock :26 which is inverted whereby to provide a seating shoulder 15 forthe laterally turned portion of a packing member 16 Which is compressedand held by a follower ring 17 and nut 18 similar to the heretoforedescribed follower ring 17 and nut 18. The bore 14 of the block iscounter sunk at its lower portioinand a valve seating ring 27 is shrunkin the lower end of the counter sunk bore. A ball valve 28 isresiliently urged against this seatin ring by an expansible coil spring29 within the counter sunk bore. The piston rod 9 is threaded in theupper end of the bore 14*, and the block 26 is provided withlongitudinal bores 24 extending from its upper end and communicatingwith radial bores 25* opening into the main bore 14 similar to the boresof the piston head block 13. The outer ends of the radial bores 25 areclosed by the follower nut 18, it be ing noted that in.eaeh instance afollower operation, downward movement of the pis ton 9 will close thevalve of the piston head 12, thus compressing air in the large cylinder6, which compressed air flows through the passage ll and through thecylinder 7 and its piston head 26 into the supply tube A 10. Upon upwardmovement of the piston heads, air is compressed in the smaller cylinder7 and flows through the piston head of the larger cylinder, thecompressing load being thus lighter on the upstroke as is usual in pumpsof this nature. With my improved piston heads, the load is immediatelytaken up on both strokes, thus materially increasing the output of thepump over the type now in common use.

What is claimed is:

l. A valved piston comprising a head block provided with a boretherethrough, one end portion of the bore being counter sunk, a valveseat member fitted in said counter sunk ortion, and a valve carried bythe head bloc and engageable against said seat, an operating rodthreaded in the other end of the bore of the head and ports eX- tendingthrough the block from the counter sunk portion.

2. A valved piston including a cylindrical block provided with alongitudinal bore and with radial bores communicating with thelongitudinal bore and with a series of lon gitudinal bores communicatingwith said radial bores, an actuating rod connected with the block, apacking disposed about the block, and a follower member for holding saidpacking disposed about the block and closing the outer ends of theradial bores.

3. A valved piston comprising, a cylindrical head block provided with anintermediate annular shoulder and provided with a passage therethrough,a valve member in the block controllin flow of fluid through thepassage, a cylin rical packing member having one end portion laterallyturned to seat on the shoulder, a follower ring disposed Within theannular packing member and bearin against the laterally turned portionthereof, and a follower nut threaded on the head block and engaging saidring to clamp the laterally turned ortion of the packing member againstthe s oulder.

4. A valved piston comprising, a cylindrical head block provided with anintermediate annular shoulder and provided with a passage therethrou h,a valve member in the block controlling ow of fluid through the passage,a cylindrical packing member having one end portion laterally turned toseat on the shoulder, a follower ring disposed within the annularpacking member and bearing against the laterally turned portion herbetween said nut and the laterally turned thereo and a follower nutthreaded on the portion of the packing member. head block and engagingsaid ring to clamp In testimony that I claim the fore oing I 10 thelaterally turned portion of the packing have hereunto set my hand atFond u Lac, 5 member against the shoulder, said nut enin the county ofFond du Lac and State of gaging the adjacent side portion of the pack-Wisemisin. ing member to compress said packing mem- NICHOLAS KOLTZ.

Copies of this patent may be obtained for five cents each, by addressingthe "Commissioner of Patents, Washington, D. C.

